My betta mal has been happy and healthy for the past few months, active as all can get. The past few days, he has been showing a cottony growth on his anal fins, which I suspected was Cotton Wool, or some other fungus. I gave him a treatment of pimafix (less than the recommended amount because I didn't want to cause complications). He is now swimming a bit weird, not coming the the surface for food, waiting for it to go to the bottom to him. He has a tilt in his swim. I don't know if the Pimafix is the cause or if it's the fungus.
Just to clarify, here's the tank specifications:
tank temp maintained at 78 degrees (heated)
Water change 2-3x a week, spaced out (Wednesdays and Saturdays without fail, close to 30%, and another day in between if I feel the ammonia get's too high [ammonia indicator on side])
I'm just a bit concerned and I have no idea why he would be doing that, I don't have a lot of experience with Pimafix and I just want to be safe, if anyone has any advice.
Thank you in advance.